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You said you're running meth, right? Could this be the problem with the bank 2 AFRs? Supposedly the meth doesn't distribute evenly, causing 5 & 6 to run lean. You may have to move your meth bungs to the hot side of the IC or at least down to the cold side of the IC.
I'm running the Vishnu PWM meth, and I noticed cyl 5 and 6 ports and valves were gummier than the other cylinders. They all had about the same amount of carbon buildup after 15k miles (cleaned last year). I will pull a log to see, but I don't remember having bad trims on bank 2 versus 1 in the past...
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RRT
E92 335i/6MT with stuff and things
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